Bauduin Kou no Akuma

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This is a prestigious boarding school surrounded by roses in a secluded forest. There was a rumor of the demon that it continued to live in the school while changing the appearance there. Eugene became friends with the "two Joshuas" who are rumored to be the said demons, but... (Source: Hakusensha, translated) Notes: Includes four extra chapters. Includes the one-shot "detour".